gnss24

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GNSS 24 Click

GNSS 24 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : Stefan Filipovic
• Date : Jan 2025.
• Type : UART type

Software Support

Example Description

This example demonstrates the use of GNSS 24 Click by reading and displaying the GNSS coordinates.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.GNSS24

Example Key Functions

• gnss24_cfg_setup This function initializes Click configuration structure to initial values.

void gnss24_cfg_setup ( gnss24_cfg_t *cfg );

• gnss24_init This function initializes all necessary pins and peripherals used for this Click board.

err_t gnss24_init ( gnss24_t *ctx, gnss24_cfg_t *cfg );

• gnss24_reset_device This function resets the device by toggling the RST pin.

void gnss24_reset_device ( gnss24_t *ctx );

• gnss24_cmd_run This function sends a specified command to the Click module.

void gnss24_cmd_run ( gnss24_t *ctx, uint8_t *cmd );

• gnss24_parse_gga This function parses the GGA data from the read response buffer.

err_t gnss24_parse_gga ( uint8_t *rsp_buf, uint8_t gga_element, uint8_t *element_data );

Application Init

Initializes the driver, resets the Click board, reads the module version, enables 1PPS output, and starts positioning.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    gnss24_cfg_t gnss24_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    gnss24_cfg_setup( &gnss24_cfg );
    GNSS24_MAP_MIKROBUS( gnss24_cfg, MIKROBUS_POSITION_GNSS24 );
    if ( UART_ERROR == gnss24_init( &gnss24, &gnss24_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    log_printf( &logger, ">>> Reset device.\r\n" );
    gnss24_reset_device ( &gnss24 );
    
    log_printf( &logger, ">>> Get module version.\r\n" );
    gnss24_cmd_run ( &gnss24, GNSS24_CMD_FW_REV_NUM_ACQ );
    gnss24_read_response ( &gnss24, GNSS24_RSP_DONE );

    log_printf( &logger, ">>> Enable 1PPS output.\r\n" );
    gnss24_cmd_set ( &gnss24, GNSS24_CMD_1PPS_OUT_SET, "1" );
    gnss24_read_response ( &gnss24, GNSS24_RSP_DONE );

    log_printf( &logger, ">>> Start positioning.\r\n" );
    gnss24_cmd_run ( &gnss24, GNSS24_CMD_HOT_START_TTFF );
    gnss24_read_response ( &gnss24, GNSS24_RSP_DONE );
    
    log_info( &logger, " Application Task " );
}

Application Task

Reads the received data, parses the NMEA GGA info from it, and once it receives the position fix it will start displaying the coordinates on the USB UART.

void application_task ( void )
{
    if ( GNSS24_OK == gnss24_process( &gnss24 ) ) 
    {
        if ( app_buf_len > ( sizeof ( GNSS24_RSP_GGA ) + GNSS24_GGA_ELEMENT_SIZE ) ) 
        {
            gnss24_parser_application( app_buf );
        }
    }
}

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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